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Complete Compiled Specification.pdf - Peck Ormsby Construction

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Duct systems shall have a clearance from combustible construction of not less than 18 inches. This<br />

clearance may be reduced to not less than three inches, provided the combustible material is protected with<br />

materials approved for one-hour fire-resistive construction on the duct side.<br />

EXHAUST OUTLETS:<br />

Exhaust outlets shall extend thru the roof, unless otherwise noted. Such extension shall be at least two feet<br />

above the roof surface, at least 10 feet from any adjacent building, property line, or air intake opening into<br />

any building, and shall be located at least 10 feet above the adjoining grade level.<br />

BRANCH TAKEOFFS:<br />

Branch takeoffs shall be high efficiency type as shown on the drawings, and shall be fitted with adjustable<br />

lock balancing dampers, complete with locking quadrants. Where dampers are not accessible for<br />

adjustment from above, concealed ceiling regulators with adjustable chrome-plated covers shall be<br />

provided.<br />

DAMPER REGULATORS:<br />

All volume dampers and splitter dampers in exposed ductwork shall be provided with Ventlock No. 640 or<br />

Young No. 443 damper regulators. Each volume damper and splitter damper concealed above an<br />

inaccessible ceiling, etc., shall be provided with a shaft extended thru the ceiling, to which shall be attached<br />

a chrome-plated Ventlock No. 666 concealed damper regulator. No. 680 Ventlock miter gears shall be used<br />

where necessary.<br />

WALL PENETRATIONS:<br />

All ducts penetrating structural or architectural walls shall be sealed air and sound tight.<br />

FIRE RATED SURFACE PENETRATIONS:<br />

All ducts penetrating fire rated surfaces shall be sealed as directed in 15050.<br />

DUCTWORK:<br />

All ductwork shall be fabricated and installed in compliance with the latest SMACNA duct manuals.<br />

Sheet metal ducts shall be properly braced and reinforced with and, where they protrude above roof, they<br />

shall be properly flashed.<br />

DUCT JOINTS:<br />

All duct joints must be sealed airtight as required by Table 1-2 "SEAL CLASSIFICATION" of the "HVAC Duct<br />

<strong>Construction</strong> Manual". The term "seal" or "sealed" means use of mastic or mastic plus tape or gasketing as<br />

appropriate.<br />

DIMENSIONS:<br />

-<br />

___________________________________________________________________________________<br />

____________<br />

SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION March 2, 2009<br />

AIR DISTRIBUTION 15800 - 4

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